4.4.2 introduces a breaking change that the variable in a catch clause
is now `unknown` type. So, we need to cast the `e`, `err`, or `error`
variables to type `Error`.
This PR ensures environment variables are set before any invocation of
the CLI. Here is a list of vars that are set:
https://github.com/github/codeql-coreql-team/issues/1124#issuecomment-852463521
This ensures the CLI knows the features and versions of the containing
actions/runner.
Additionally:
- Fix the user agent so that it more closely aligns with user agent
spec
- Refactor environment variable initialization so that it all happens in
one place and call.
- Move Mode, getRequiredEnvParam, setMode, getMode out of actions-util
and into util. actions-util is meant for utils only called by the
action, not the runner.
The `prepareLocalRunEnvironment()` method is most likely deprecated and
should be removed. I originally added it because I had a way of working
where I would run the action from my local machine to test out changes,
but this was always a little flaky. So, I no longer use this way of
working. I will probably remove it soon.
This commit changes the way the action determines if running in action
or runner mode. There is now an environment variable that is set at the
beginning of the process and elsewhere in the process, we can check to
see if the variable is set.
As we move towards analysing the merge commit for pull requests by
default, we should stop sending `/refs/pull/n/head` rather than
`refs/pull/n/merge` _unless_ the checked-out SHA has actually changed.
Here we assume that any change (compared to GITHUB_SHA) indicates that
`git checkout HEAD^2` has been run earlier. This may sometimes be
incorrect (e.g. `git checkout mybranch`), but in that case the ref
would be wrong either way.
